The function of wide-angle lens:
A wide-angle lens is a photographic lens with a focal length shorter than a standard lens, a viewing angle greater than the standard lens, a focal length longer than a fisheye lens, and a viewing angle smaller than a fisheye lens Wide angle lenses are divided into two types: ordinary wide-angle lenses and ultra wide angle lenses
The focal length of a regular wide-angle lens in a 135 camera is generally 38-24 millimeters, with a viewing angle of 60-84 degrees; The focal length of the ultra wide angle lens is 20-13 millimeters, and the viewing angle is 94-118 degrees
Due to the short focal length and large viewing angle of wide-angle lenses, they can capture larger areas of scenery within a shorter shooting distance range. So, it is widely used for shooting large-scale style photography works In photography creation, using a wide-angle lens can achieve the following effects:
1. It increases the depth of the photographic image
2. Due to the long scenery, the front and rear scenes of the subject can be clearly reproduced on the screen, so most compact cameras (commonly known as point and shoot cameras) now use ordinary wide-angle lenses of 38-35MM
3. The lens covers a large area and captures a wide range of scenery
4. The scene captured at the same distance has a smaller image in the frame compared to the scene captured with a standard lens.
Defects:
Defects such as perspective distortion and image distortion are prone to occur in the image. The shorter the focal length of the lens and the closer the shooting distance, the more significant these defects become. Therefore, when taking portraits, it is not advisable to approach 0.6 meters to avoid perspective distortion. If using a regular wide-angle lens to take standard portrait photos for ID purposes, it is recommended to take a half waist or knee level image. When using a super wide-angle lens to take such portrait photos, it is recommended to take a full body image and then crop it during the magnification process to obtain a standard portrait photo, which can avoid perspective distortion. Of course, sometimes when taking portraits of people, this perspective distortion can also be consciously utilized to alleviate certain facial defects of the subject. If the subject has a narrow forehead and wide jaw, shooting from a slightly higher perspective can offset their defects; On the contrary, low angle overhead photography can be used.
When using a wide-angle lens to shoot a full body portrait, if low angle shooting is used, distortion may still occur. However, sometimes this feature can be used to compensate for certain shortcomings of the subject itself. For example, if some subjects have shorter legs and longer upper bodies, using this angle of shooting will make the legs appear slender in the picture, increasing their aesthetic appeal. Using a wide-angle lens for shooting not only produces perspective distortion, but also edge distortion. This distortion is mainly caused by the oblique projection angle from the back of the lens to the edge of the film's field of view. When shooting group images, it is easy to blur the edges of the image The subject becomes short and chubby.